"Not out of sight" can be replaced by several synonyms, to convey the same meaning in different words. Some of these synonyms include "within view", "visible", "in plain sight", "observable", "evident", "apparent", "noticeable" and "perceptible". These terms convey different shades of meaning, but all emphasize that the object or phenomenon being referred to is clearly visible and easily detectable. Using synonyms allows for more variety and precision in language, adding interest and depth to written and spoken communication.